Nurses · Truck drivers · Police & fire · Warehouse
Every shift has one hour
that breaks people. Find yours.
Sleep advice assumes you sleep at night. Pick your shift and watch where your body’s lowest hour actually lands — including whether it sits on top of the drive home.
Pick your shift
Why nights end wired
Home at 7am and you cannot sleep. Out cold at 2pm. Wide awake at 11pm. That is a timing problem, not a discipline problem.
The drive home problem
On most rosters the drive home lands in your worst hour. That is exactly when drowsy-driving crashes happen.
Why days off reset it
You start to adjust around day three. One weekend back on days wipes it out, and you pay for it again next run.
Seven days of one roster
It isn’t a bad night.
It’s the same hour,
every night.
Time runs down the spiral, one turn per day. The curve is widest when you are most alert and narrowest at your worst hour. That hour lands at the same time every day, so it stacks into one red seam.
The pale band is the shift. Where it crosses the seam is the part no amount of coffee fixes.
Drag to rotate
3:00 AM, every night you work
The building is quiet. Your body isn’t confused about the time — it just disagrees with you.
You can’t talk your body clock into a new schedule. You can move it, with light, at the right hour. That is the entire job.
Why willpower doesn’t work
One hour of the day, your body has decided it is the middle of the night.
It is called your core body temperature minimum. Reaction time, judgement, mood and your ability to fall asleep at all are organised around it. Shift work is not a discipline problem. It is a timing problem.
LIGHT YOU SEEK
Light before that hour pushes your clock later — the direction a night worker needs.
LIGHT YOU BLOCK
Light after it drags your clock back earlier. Which is why the daylight on your drive home quietly undoes everything you did all night.
That is the whole lever. A pair of sunglasses at the right minute moves your clock further than any supplement on the shelf — but only if you know which minute.
What this is built on
Four rules. That is the whole method.
- There is one hour when your body is at its worst
- It lands about two hours before you would wake up on your own. Reaction time, judgement and mood all bottom out. Every time in your plan is built around where that hour falls.
- Core body temperature minimum
- Light before it pushes you later. Light after it pulls you earlier
- Same light, opposite effect, depending on when it hits you. That is why daylight on the drive home undoes more than anything you do once you are in bed.
- Phase response curve
- Do not try to flip all the way
- You do not need to go nocturnal. You need your worst hour moved off your shift and into your sleep. A full flip does not survive your days off anyway.
- Compromise phase position
- Keep one block of sleep the same every day
- The same hours on work days and days off. It stops your clock sliding all the way back, so the next run of nights starts closer to where you left off.
- Anchor sleep
What it doesn’t do
- — It doesn’t measure your sleep. No watch, no ring, no microphone.
- — It doesn’t diagnose anything, and it isn’t medical advice.
- — It works out your worst hour from your wake time. It does not measure it.
- — It won’t make a 12-hour night shift feel like a day shift. Nothing will.
ShiftDawn is a scheduling and education tool. If you fall asleep without meaning to, or suspect a sleep disorder, see a clinician — and take your map with you.
What the 30 days actually give you
Six timings, built around your roster. Not general sleep advice.
Bright-light window
The hours to load up on light, to the minute
Light-block window
When sunglasses go on — the step that decides everything
Main sleep window
When to be in bed, not when to 'try'
Pre-shift nap
Whether you need one, and exactly when it ends
Caffeine cutoff
The last safe cup, worked back from your sleep
Days-off protocol
Anchor sleep so a weekend doesn't cost you the whole rotation
What the first two weeks look like
- Day 1
You fix the commute
If your crash window overlaps the drive home, that's the first thing you change — and it costs nothing but a pair of sunglasses in the car.
- Days 2–3
It feels worse before better
Moving a body clock is a real physiological change. Most people quit here and decide it doesn't work. This is the part everyone else leaves out.
- Day 4
Your worst hour moves off your shift
At roughly 1–1.5 hours a day, your lowest hour clears your working hours and lands inside your sleep instead.
- Week 2
Days off stop resetting you
You keep one block of sleep the same all week. That is what stops your days off wiping out the progress.
Already looked at the others?
Most sleep apps track what already happened to you and score it. Useful, but a score doesn’t tell you what to do at 6:30am tomorrow. This gives instructions built from your roster, and it works without a watch, a ring or any hardware at all.
The deal
- 30 days free. Nothing charged today.
- $59/year after that — under $5 a month.
- Cancel in two taps from your Whop account, any time before it ends.
I’ve tried sleep apps. They didn’t help.
They assume you sleep at night. Morning light, wind down at 10, consistent bedtime — every one of those is wrong for a night worker, and some of it actively makes you worse.
Can you actually move a body clock?
Partly, and partly is the point. You do not need to flip all the way. You need your worst hour moved off your shift and into your sleep. That is usually a few hours, and it moves about an hour a day if you get the light right.
My roster changes constantly.
Then it matters more, not less. On a rotating roster you pay the cost every single cycle. The plan covers the changeover days and how to hold on to it through your days off.
Is this medical advice?
No. It is a scheduling tool built on published sleep research. If you think you have a sleep disorder, see a doctor, and take your plan with you.
Read first, if you prefer
Guides by roster
- 12-Hour Night Shift Sleep Schedule (7pm–7am)A 7pm to 7am sleep schedule built around your worst hour. When to sleep, when to get light, when to block it, and when to stop caffeine.
- Night Shift Sleep Schedule for NursesThree-on-four-off, rotating days and nights, and the flip back on your days off. What the research actually says about sleeping around a nursing roster.
- How to Sleep on a Rotating ShiftOn a rotating roster you pay the cost every cycle. Here is how to make it smaller: which way your shifts rotate, one fixed block of sleep, and the changeover days.
- Truck Driver Sleep Schedule and Fatigue TimingWhen you are most likely to microsleep, how that lines up with hours-of-service, and what to do about the pre-dawn stretch.
- Switching From Night Shift to Day ShiftA day-by-day plan for coming off nights and onto days. How far to move your sleep each night, when to get light, and when to stop.
- 4 On 4 Off Sleep ScheduleSleep, light and caffeine timings for both halves of a 4-on 4-off rota, plus the changeover days that decide whether the block works.
- Night Shift Caffeine TimingCaffeine timing for night workers, based on how long it stays in you and when you actually sleep. When the first cup helps, and when the last one costs you.
- 2-2-3 (Panama) Shift Sleep ScheduleA sleep schedule for the 2-2-3 Panama roster. Where your worst hour lands on night one versus night three, what to do with the two-day breaks, and the long weekend.
- DuPont Schedule Sleep GuideHow to sleep on a DuPont rotation. The four-night run, the day-to-night turnaround, the single day off that does the most damage, and the seven-day break.
- 7 On 7 Off Night Shift Sleep ScheduleA sleep schedule for 7 on 7 off night shifts. Why this is the roster where fully flipping pays, how to handle the turnaround at both ends, and what to do with the seven days off.
Find the hour that’s wrecking you.
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